2016 California Standards for Accessible Design Pocket Guide - Eff. Jan. 1, 2017
11B-405.7.5 Doorways.
Where doorways are located adjacent to a ramp landing, maneuvering clearances required by Sections 11B-404.2.4 and 11B-404.3.2 shall be permitted to overlap the required landing area. Doors, when fully open, shall not reduce the required ramp landing width by more than 3 inches (76 mm). Doors, in any position, shall not reduce the minimum dimension of the ramp landing to less than 42 inches (1067 mm).
[2010 ADAS] 405.7.5 Doorways. Where doorways are located adjacent to a ramp landing, maneuvering clearances required by 404.2.4 and 404.3.2 shall be permitted to overlap the required landing area.
ETA Editor's Note
Since 2010 ADAS makes no distinction between top, bottom and intermediate landings, CBC is more stringent regarding ramp landings. Also, CBC allows less encroachment of doors onto ramp landings.
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